How do you get fishing rod?

Water Pokémon can also be obtained through use of the HM Surf across 'clear blue water' and the HM Dive underwater in tall grass.

No guy, He/She probably want to know how to get a water Pokemon and didn't get the old rod in Dewford and beat the Petalburg gym and Mr. Brinay wasn't at his cottage or Slatport, So you couldn't get back to Dewford to get the rod to get a water Pokemon to surf! Same Problem I have and I am currently working on a solution to. If I find one I will put the answer on here.

--- Ok I found one, Catch a Marill or and Ezuirel ( Marill's lesser form ) and then teach it surf. :) Took me a while to find a simple answer that was right in front of me. Well there you go.